saddam hussain hanged till death."why so"???????????????

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Saddam hussain was killed just before 'id'.there must be some reason behind this.but what????????????????????????????this question is just eating my head.it may be that he was becoming a threat to america........................as we know that he had an eminent personality,was a great leader too....................he was working hard to develop iraq.and it was developing very fast,no doubt................was it becoming a problem for america.please help me by giving your precious views....